Board Thread:Pokémon Help/@comment-30449951-20171128222720

I want to create a good competitive team.

So far I want to use my hydreigon that I traded for:

Quirky (Sadly) 252 sp. atk, 252 speed, 4 def. Flamethrower, Flash cannon, Dragon pulse, Dark pulse. Life orb, Levitate, Pretty 'meh' ivs.

I also want to use my shiny marshadow:

Adamant, (To be:) 252 atk, 252 speed, 4 hp. Spectal thief, Close combat/Drain punch, Rock tomb, Bulk up. Technician, No clue what item, Good attack and speed ivs.

What others could I use (trying to think of some walls and some fairy type coverage) that would be good? I'm also trying to think of a good wall, and a good stealth rock sacrifice. Also wondering how I could change my two Pokémon already to be better. Any tips?

(my heatran is bad, so I'm not using him.) 